Hello ArcView users! I asked whether anybody knows if there exists an ArcView script or extension emulating the ArcInfo Command TOPOGRID. I got a very useful hint from Gregg and David - thank you very much both of you! They suggested to use the ANUDEM software which was created at the Australian National University. The ArcInfo Topogrid command is based on the ANUDEM software, but ANUDEM additionally provides statistics on the quality of the DEM. ANUDEM is available for about 1K Australian dollars from the Australian National University. http://cres.anu.edu.au/outputs/software.html http://www.ncgia.ucsb.edu/conf/SANTA_FE_CD-ROM/sf_papers/hutchinson_michael_dem/local.html See also: Wilson JP & Gallant JC (2000) "Terrain Analysis - Principles and Applications". John Wiley and Sons NewYork pp 479 However, if anybody still knows an ArcView script or extension emulating the ArcInfo TOPOGRID command - please tell me. Thanks again to Gregg and David and best wishes from Austria! Stephan -- Stephan Jenewein Department of Geography University of Innsbruck